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We're about to learn a lot more than we ever wanted to know about Tori Spelling's sex life.

In an explosive new clip from her reality show "True Tori,"Dean McDermott tries to explain why he had an affair while promoting "Chopped: Canada" in Toronto over the holidays -- saying he and his wife weren't "intimate" the night before he left.

"I was feeling like, you're not going to be intimate with me, I'll find somebody who wants me," he says. "I was 250 pounds, I felt like s**t and I needed some validation."

But Tori ain't having it -- and starts unloading on her husband, saying he's totally full of it.

"Two weekends in a row, we did things we had never done before because you wanted it, you kept wanting to raise the bar," Spelling screams at him.